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  • 1
    ISSN: 1573-6903
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The labeling of proteins in the particulate subcellular fractions and in the cell sap was studied in the cerebral cortex of rabbits 24 hours after a single electroconvulsive shock (ECS). To this end the animals were injected with [3H]valine subarachnoidally and sacrificed 30 minutes later. The incorporation of the labeled aminoacid into proteins was slightly increased in all subcellular fractions but the increase was significant only for soluble proteins. Referring to the type of soluble polypeptides found in the cortex at this post ECS phase, no modification was found in the SDS electrophoresis pattern of steady state proteins. The fractionation pattern of labeled soluble proteins showed in one third (3 out of 9) of the experiments a remarkable stimulation of the synthesis of two polypeptides (25,000 and 54,000 Dalton MW), which were not labeled in the controls.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1590-3478
    Keywords: Cerebral Blood Flow ; free tryptophan ; serotonin ; subclinical hepatic encephalopathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Abbiamo determinato il Flusso Ematico Cerebrale (CBF), tramite la metodica inalatoria non invasiva allo Xenon-133, i livelli plasmatici di Ammonio (NH3) e del Triptofano libero (fTRP) in 30 pazienti cirrotici senza encefalopatia conclamata. La valutazione psicometrica rivelò un'Encefalopatia Epatica Subclinica (SHE) in 20 di loro, mentre negli altri 10 era nei limiti della norma. Una differenza significativa (p〈0.05) dei valori di CBF fu riscontrata tra i pazienti con SHE e quelli senza SHE. I livelli di fTRP erano significativamente più elevati (p〈0.05) nei pazienti con SHE rispetto a quelli senza SHE e una correlazione negative statisticamente significativa (p=0.003) fu trovata tra i valori di CBF e quelli di fTRP nell'intero gruppo dei pazienti. I livelli di NH3 non differivano nei due sottogruppi e non correlavano con i valori di CBF. Si conclude che la SHE potrebbe avere un ruolo nella riduzione del CBF osservata in alcuni pazienti, anche se il suo ruolo preciso non è ancora chiarito. Ulteriori ricerche sono necessarie per chiarire le interazioni tra il CBF, il fTRP ed i sistemi neurotrasmettitoriali serotoninergici nella genesi della compromissione encefalica in corso di cirrosi epatica.
    Notes: Abstract Cerebral blood flow (CBF), measured by the non-invasive 133-Xenon inhalation method, plasma levels of ammonia (NH3) and free tryptophan (fTRP) were determined in 30 cirrhotic patients without overt encephalopathy. Psychometric evaluation detected subclinical hepatic encephalopathy (SHE) in 20 of them, and was normal in the other 10. A significant CBF difference (p〈0.05) was found between the SHE and the non-SHE patients. fTRP levels were significantly (p〈0.05) higher in patients with SHE than in those without SHE, and a significant negative correlation (p=0.003) was found between CBF values and fTRP in the whole group of patients. NH3 did not differ in the two subgroups and did not correlate with CBF values. It is concluded that CBF could have some implications in SHE, although its relevance is still unclear. The negative correlation between CBF and fTRP prompts further investigation concerning the relationships between plasma fTRP, brain serotonin, cerebral metabolism and blood flow in the development of brain derangement during cirrhosis.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 9 (1988), S. 403-404 
    ISSN: 1590-3478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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